Die rolling



Nov. 10 1925- W. P. WITHEROW DIE ROLLI NG Filed Aug. 1, 192's Patented Nov. 10, 1925.

UNITED STATES PATENT OFFICE.

WILLIAM P. WITHEROW, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WITH EROW STEEL CDMPANY, 0F NEVILLE ISLAND, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

DIE ROLLING.

Application filed August 1, 1923. Serial-No, 655,061.

7 '0 all whom, it may concern Be it known that I, TILLIAM P. l/Vririnnow, a. citizen of the United States, residing at Pittsburgh, Allegheny County, Pennsylvania, have invented a new and useful Improvement in Die Rolling, of which the following is a full, clear, and exact description.

The present lllVGl'ltlOlLlGliltfiS broadly to metal rolling, and more particularly to the 0 art of die rolling, in which accuracy and uniformity in the dimensions of the successive blanks or articles produced bythedie rolls is important.

While the art of die rolling lends itself admirably to the production of enormous tonnage of blanks or articles due to the rapidity with which metal can be shaped by the rolls, considerable difiiculty has hereto- :t'ore been experienced, due to the fact that at different l'l!l'l(,S, QllZl101 on the same or different mills, blanksior articles of varying lengths have been formed. This has made it necessary to perform at least one addi- ,tional operation on the blanks or articles so produced, in order to bring them to the required dimensions. By almost constant study of the art of die rolling, I have been led to the belief that variations in length of the blanks produced I :10 may be attributed to a considerable extent to the action of the die rolls on the metal. being worked. formed on any given length of metal stock is varied by varying the amount of roll slip,

5 there is a corresponding variation in the length of the resulting article. This is somewhat contrary to themetal Working art broadly in which variations in length are produced by increasing the temperature for 40 increased length and decreasing the temperaturefor decreased lengths. In the metal rolling art broadly the results obtained by variations. of temperature can apparently be explained by the variation in the ease with which the metal may be reduced in accordance withdifi'erent temperatures and also by reason of the fact'that the number of passes may be varied so that certain results can be obtained.

It the amount of work per-- As disclosed in my United States Patent No.1,516,069 of November 18, 1924, it is possible to vary the action of the rolls, and correspondingly control'the length of blank produced, bycertain temperature changes in the metal being worked. Also, as disclosed in my 655,060 may be produced either 'with or without temperature changes by changing the speed atwhich the die rolls are operated. I believe that in the latter case, the operation of the rolls at a higher speed produces blanks having a less length than would be produced it the rolls were operated at normal speed, by reason of the fact that the roll slip changes in some definite proportion to the roll speed.

In accordance with the present invention. I produce variations from lengths of blanks in still another way. This invention has several advantageous features, among which may be mentioned the production of smoother blanks by reason of the.

elimination of scale from the billets being die rolled and also the ease of control of the lengths of the blanks produced.

In the accompanying figure of drawings, I have shown more or less diagrammatically for purposes of illustration only, one em bodiment of the present invention, it being understood that changes in the construw tion and operation may be made without departing from the spirit of the invention or the scope of my broader claims.

In the drawings, I have illustrated a stand of rolls comprising an upper roll 2 and a lower roll 3, adapted to be driven in any desired manner in the direction indicated by arrows. Positioned at the entering side of the rolls, there is provided a nozzle or plurality of nozzles 4, adapted to direct a stream of fluid of suitable character against some or all of the surfaces of the billet, being rolled, the fluid being initially directed against the billet in a direction in opposition to its travel through the rolls. While I have found that either air, steam or water may be eltectively used for this purpose, I have preferably utilized water due to its greater copending application, Serial No. filed August 1, 1923 similar results the normal the longer, comparatively, is the blank pro-v ill 'duced by the die rolls.

In obtaining the full benefits of the present imrention,'the metal may all be initially heated to a temperature somewhat higher than that which would normally be required.

Thisfacilitates the initial treatment of the billet in the roughing passes, and makes it possible to supply a leader of the required shape and section to the die rolls at a comparatively high temperature. If this leader at this temperature when rolled produces blanks which are too short, it is only necessary to increas the supply of cooling fluid directed against the leader. In this manner, it is possible to easily and quickly produce changes in the lengths of blanks produced by the die rolls, whereby thcdesircd uniformity is insured.

It will be obvious to those skilled in the art that the application of fluid to the metal 30 being rolled may be utilized for effecting the desired results, or the result may be partially obtained by rarying the amount of fluid or its temperature and the remaining compensation in the \length effected by a variation in the roll speed. Thus, for ex ample, if the resulting blank produced by the rolls is too short, the temperature of the enteringleader may be reduced by the application of the proper quantity of fluid at the proper temperature, or the necessary increase in the length may be obtained partially by the application of a greater amount of fluid, or fluid at a. lower temperature; and iby decreasing the roll speed. To produce a shorter blank, the opposite steps will be carried out.

The variations in roll speed and temperature should also preferably bear a definite relation to the reduction which is being ef- IJ fected in. the metal by the die rolls. In other Words, as the'per cent of reduction increases, an increas in roll speed, either with or Without a decrease in the amount of cooling v fluid, will produce a shorter blank than would be produced under the same conditime if the per cent of reduction was less.

' It may also be that the length. of the blank produced is dependent upon the removal of scale from the leader being die rolled. Thus,

a as the temperature of the leader is reduced by the application of a greater volume of V fluid under pressure, the amount of scale IS/IJIGSBHCGd a surface which may be 6fi 6C-- tiyelygrippedby the die rolls,

is 1accmdingly reduced, and therefore, there against the billet ,not

slstmg in passing a leader through the die The advantages of the present invention arise from the provision of a method for quickly and easily varying the (fOIHIMUulLlVO lengths of blanks produced by die rolls, whereby uniformity in successive blanks is insured.

I claim: l

1. In the method of die rolling blanks of a desired length from leaders, the steps consisting-in passing a loader through the die rolls and directing a cooling fluid thereagainst, and thereafter passing other leaders through said die {rolls and varying the amount of cooling fluid directed thereagainst to produce blanks varying in length from those produced from the first mentioned leader, substantially as described.

2. In the method of die rolling blanks of a desired length from leaders, the steps conrolls and directing a cooling fluid thereagainst, and thereafter passing other leaders through the same die rolls and varying the amount ol" cooling fluid directed thereagainst to produce blanks varying in length from those produced from the first mentioned leader, the variation in amount of cooling fluid being in accordance with the percentag of reduction to be cll'cctcd by the die rolls, substantially as described.

3. In lhc method of die rolling blanks of adcsired length from leaders, the steps consisting in passing u'lczuler through the die rolls and directing a cooling fluid thereagainst, and thereafter passing other lead- 100 crs through the same die rolls but with an increased amount of cooling fluid directed thereagainst to produce blanks longer than thosofproduced from the first mentioned leader, substantially as described.

t. In the method of die rolling blanks ofa desired length from leaders, the steps consisting in passing a leader through the die rolls and directing a cooling fluid thereagainst, and thereafter passing other leaders through the sau'udiv rolls but with a decreased amount of cooling fluid directed thcreagainst so as to produce blanks shorter than thoseproduced from the first mentioned leader, substantially as described.

5. In the method of die rolling blanks of a desired 'lengthfrom leaders, the steps consisting in passing a leader through the die rolls and directing a cooling fluid thereagai'nst, and thereafter passing other leaders 120 throughthe same die rolls and varying the amount of cooling fluid directed thereagainst to produce blanks varying in length from those produced from the first mentioned leader, at the same time varying the roll 125 speed of the die rolls, substantially as described.

(i. In the method of a desired length of dierolling blanks from leaders, the steps consisting in passing a leader through the 9 die rolls and directing a cooling fluid therespeed of the d against. and thereafter passing other leaders through the same die rolls and Varying the :1 mount of cooling fluid directed thereagainst to produce blanfcs varying in length from those produced .i'rom the firsb mentioned leader, at the same time varying the T011 reduction to b In testimon my hand.

stantially as described y whereof I haw hex'eunio set is rolls, b0 th of said; variations bemg 1n accordance wlth the percentaga of e effected by the die rolls, sub- LLIAM 'P. WHHERQ 

